I will be powering my Kitfox with a Rotax 916iS A, the newest engine in the Rotax 9 series.
Here is a description from the engine wiki page...
The engine is a turbocharged four-cylinder, four-stroke, horizontally-opposed, 1,352 cc (82.5 cu in) displacement, gasoline engine design, with a mechanical gearbox reduction drive with a reduction ratio of 2.54:1. It employs dual electronic ignition and produces 160 hp (119 kW) at 5800 rpm for takeoff and 137 hp (102 kW) at 5500 rpm continuous operation, with a maximum operating altitude of 23,000 ft (7,010 m).
It has electronic fuel injection; air cooling, with liquid-cooled cylinder heads; a stainless steel exhaust system; a dry sump, forced lubrication system with a separate oil tank; FADEC control and a 12 volt or 24 volt electric starter.
The initial time between overhaul is 2,000 hours.